Yes, TIC is a valid Scrabble word!
a habitual spasmodic contraction of the muscles, most often in the face
Synonyms: twitch, spasm, jerk, convulsion, contraction, tremor, tremble
an idiosyncratic and habitual feature of a person's behaviour
Synonyms: idiosyncrasy, peculiarity, oddity, eccentricity, foible, whim, whimsy, notion, conceit, vagary
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